Safe havens for young planets

Eso_potw1905a_1024

eso_potw1905a February 4th, 2019

Credit: ALMA (ESO/NAOJ/NRAO), S. Andrews et al.; NRAO/AUI/NSF, S. Dagnello

This weeks Picture of the Week focuses on one of twenty protoplanetary discs explored and imaged by ALMAs first Large Program, known as the Disk Substructures at High Angular Resolution Project (DSHARP). The disc is called AS 209, and its substructures are particularly pronounced thanks to its thin, high-contrast rings and almost face-on orientation towards us. Though concentric rings shown here in particularly beautiful clarity are a common substructure among such discs, their widths, separations, and number can vary greatly. Its still unclear how these substructures form, and how planets emerge from them. Quantifying and studying these similarities and differences was a motivator for constructing ALMA, and was the main objective of DSHARP. These details may hold clues to the type of planetary system that will eventually emerge. One interpretation is that there may be a rapid and complex interplay between young protoplanets and the disc itself far earlier in the evolution of the planetary system than previously thought. A leading theory of planet formation requires dust within these discs to clump into grains, then pebbles, and eventually planetesimals. This theory has always been stumped, however, by the fact that once an object reaches a certain mass, the dynamics of these discs would cause it to be sucked into the host star at the centre, thus halting its growth into a true planet. The results from the DSHARP program suggest that disc substructures may perturb these dynamics and provide safe havens where young planetesimals can continue growing making the substructures observed here crucial to our own existence. Next weeks picture will be the final instalment in the DSHARP series, and will showcase another of the twenty images: this time a multiple star system.

Provider: European Southern Observatory

Image Source: https://www.eso.org/public/images/potw1905a/

Curator: European Southern Observatory, Garching bei München, None, Germany

Image Use Policy: Creative Commons Attribution 4.0 International License

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Image Details

Image Type
Observation
Object Name
AS 209
Subject - Milky Way
Star > Circumstellar Material > Disk > Protoplanetary
Eso_potw1905a_128
 

Position Details

Position (ICRS)
RA = 16h 49m 15.3s
DEC = -14° 22’ 8.6”
Orientation
North is up
Field of View
0.1 x 0.1 arcminutes
Constellation
Ophiuchus

Color Mapping

  Telescope Spectral Band Wavelength
Arrow_left_orange Atacama Large Millimeter/submillimeter Array (Band 6) Millimeter (240GHZ / 12CO J=21) 1.3 mm
Spectrum_ir1
Arrow_top_orange
Eso_potw1905a_1280
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ID
potw1905a
Subject Category
B.3.7.2.1  
Subject Name
AS 209
Credits
ALMA (ESO/NAOJ/NRAO), S. Andrews et al.; NRAO/AUI/NSF, S. Dagnello
Release Date
2019-02-04T06:00:00
Lightyears
Redshift
Reference Url
https://www.eso.org/public/images/potw1905a/
Type
Observation
Image Quality
Distance Notes
Facility
Atacama Large Millimeter/submillimeter Array
Instrument
Band 6
Color Assignment
Orange
Band
Millimeter
Bandpass
240GHZ / 12CO J=21
Central Wavelength
1250000
Start Time
Integration Time
Dataset ID
None
Notes
Coordinate Frame
ICRS
Equinox
J2000
Reference Value
252.313764812, -14.3690672266
Reference Dimension
1500.0, 1500.0
Reference Pixel
750.0, 750.0
Scale
-1.1249432545674022E-06, 1.1249432545674022E-06
Rotation
-0
Coordinate System Projection:
TAN
Quality
Position
FITS Header
Notes
Creator (Curator)
European Southern Observatory
URL
http://www.eso.org
Name
Email
Telephone
Address
Karl-Schwarzschild-Strasse 2
City
Garching bei München
State/Province
None
Postal Code
D-85748
Country
Germany
Rights
Creative Commons Attribution 4.0 International License
Publisher
European Southern Observatory
Publisher ID
eso
Resource ID
potw1905a
Metadata Date
2018-12-06T13:46:50-05:00
Metadata Version
1.1
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Detailed color mapping information coming soon...

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There is no distance meta data in this image.